Pressure accumulator apparatus



April 23, 1940. E. A. RocKwELL PRESSURE ACCUMULATOR APPARATUS sheets-sheet 1 Filed Oct. 15, 1956 April 23, 1940. E. A. RocxwELl. 2,197,772

PRESSURE ACCUMULA'XOR APPARATUS Filed oct. 15, 195e '1 Smets-sheet 2 S am INVENTOR ATTORNEa April 23, 1940. E. A. RocKwx-:LL

PRESSURE ACCUMULATOR APPARATUS Filed Oct, 15, 1936 7 Sheets-Sheet -3 A I lNvEN'ToR ld (Mi-wl M my@ 7 ATTO Nr-:Y

NNN

7 Sheets-Sheet 4 Filed Oct. 15. 1956 w ,QM BY M ATT April 23, 1940. E. A. RocKwELl.

PRESSUR ACCUMULATOR APPARATQS Filed Oct. 15, 1956 '7 Sheets-Sheet 5 INVENTOR R. ww um NM. um m m m m o Y 0 0 um m ma 0 n UHT# o. ,M 1w@ w m if@ NH m ww m ev mw Mw. 1 m w.- o o ww w n um ATTO April 23, 1940 E. A. RocKwELl. 2,197,772

PRESSURE ACCUMULATOR APPARATUS Filed Oct. 15, 1936 7 Sheets-Sheet 6 CIKCU/ 7' AND VOLTAGE REGLMATOR INVENTOR 259 -.Qnm

i ATToRNi-:

April23, 1940. E, A RQCKWELL 2,197,772

PRESSURE ACCUMULATOR APPARATUS v Filed Oct. 15, 1936 7 Sheets-Sheet 7 GENERATOR MTTERY (ffy. 12,.

INVENTOR EZKMAMLWL ATTORNEY manzana) UNITED STATES PATENT ori-ics PRESSURE ACCUMULATOB, APPARATUS Edward A. Rockwell, West Hartford, Conn.

Application October 15, 1936, Serial No. 105,679

83 Claims. y(Cl. 10S-25) zlil of any and all accessories thereon.

The present application is partly a continuation of my copending application upon Electroilow power Supply system, Ber. No. 28,699, iiled June 21, 1935, patented November 15, 1938, No.

il 2,136,638. l

Ihe object of my invention is to provide an accumulator apparatus by means of which liquid may be stored under` a high pressure from a pumping unit, which may be driven, if desired. with only a small electric motor and pump and which need be operated only a portion of the time so that there is only a small drag on the electric battery accordingly. A further object of my invention is to provide an etlective ltering of the liquid pressure medium. Still another object is to provide eiiicient means for controlling the electric current drive of the electric motor. In an improved form' of my invention the object is, n furthermore, to locate the controlling switch of the electric motor outside of thezbody of pressure liquid to avoid electrolytic action and dispersion of metal therein, also to avoid wear on the said switch. Still another object is to provide such an accumulator apparatus so constructed as to occupy a minimum amount of space in view of the limited space available for the same on the automobile chassis, and especially to reduce as far as possible the length of the entire apparatus. Again, another object is to locate the seals in the plunger operated switch so as to avoid scoring by accumulated dirt thereon. Further objects of my invention will appear from the detailed description of the same hereinafter set forth in the u several embodiments of my invention in the ac- Fig. 4 is a perspective view of the switch sleeve therein;

Fig. 5 is a diagrammatic View illustrating an assembly of the accumulator with the electric circuit for operating the electric motor and showl ing in elevation a modined form of my accumulator;

Fig. 6 is an enlarged vertical section of the form of accumulator shown in Fig. 5;

` Fig. 7 is a vertical cross-section thereof taken 19 on line 1-1 of Fig. 6;

Fig. 8 is a view showing the details of the pump of Fig. 1;

Fig. 9 is a vertical section of a modied form of controlling switch for the electric motor; ll

Fig. 10 is a diagrammatic detailed view showing the circuit arrangement for the said accumulators;

Fig. 11 is a diagrammatic view of a modiiied form of circuit arrangement for the same; zo

Fig. 12 is an elevation of the magnetic switch shown in Fig. 11;

Fig. 18 is an end elevation of the same;

Fig. 14 is a plan view of the internal Iparts of the pump shown in Fig. 6; and 26 Fig. 15 is a section of the same taken on line In the drawings, referring rst to Figs. 1 to 4, which comprise subject matter divided out from my copending application above referred to, the low pressure return liquid, after having been utilized for the operation of any desired mechanism, as for example an automotive accessory, is admitted by a low pressure port I to a pressure accumulator and supply reservoir 2 which is made 35 of thin metal. The supply reservoir 2 is mounted upon a pump casing 3 and is supported by a bracket l between rubber Washers-5 on screws 5 screwed to the pump casing 9. The bracket 4 is secured on the chassis. The low pressure liquid o passes from the port I through a filter-supporting head l having a slitted flange 8 to hold tight against the inner face of the casing 2 an annular cloth 9, the rear end of which passes around a ring I9 supported beyond the iilter head ',l. The 45 other end of the lter cloth 9 is supported by a ring I'I against a anged disk -'I2. The disk is secured against the pump housing 3 by means of six screw-threaded rods I9. The rear ends of said rods support the head I between nuts Il on the rods I9. The rods I9, furthermore, support against the face of the nuts Il a plurality of washers I5, the nuts I4 serving to clamp between said washers I5 and the disk I2 a plurality of tubes I 6 which serve not only to space the washers 56 I5 away from the disk I2 butv also to keep the filter cloth 9 taut and, furthermore, to act together with the rods I3 as guides for maintaining the alignment of six accumulator springs |1, each of which surrounds a tube |6. The springs |1 are provided to accumulate stored pressure in the reservoir 2 by their further compression, it being understood, furthermore, that the springs I1 are piled into the reservoir initially under great pressure so that when these springs are further compressed to the maximum within the reservoir 2 they will exert upon the liquid a pressure, for example, of 500 lbs. per square inch, which is the stored pressure under which the apparatus preferably operates in supplying the liquid under pressure in the operation of the system. The liquid, after passing through the lter cloth 9, will enter a return passageway |8 in the pump casing 3 and will thence pass through a low pressure return inlet |9 to lthe pump which is driven by an electric motor 20 having a shaft '2| arranged to be connected by a driven sleeve 22 having a slot 23 with a pump shaft 24 having a tongue 25 at the forward end thereof. The pump ,shaft 24 is connected at its other end by a rearward tongue 26 with an auxiliary pump shaft 21. On the shaft 24 there is a forward end plate 28 having a central port 29 which is situated just in the rear of a sealing ring 30 of the same rubber as hereinabove referred to, and which is positioned on the shaft 24 by a retaining plate 3|. The end plate 28 has four screws 32 therein for clamping the same to a central stationary pump member 33 into which they are screw-threaded. Between the end plate 28 and the pump member 33 there is a gear housing 34 having a recess 35 for pump gears 36 and 31, the gear 36 being doweled on the end of the shaft 24. Between the pump member 34 and the end plate 28 there is a spacing member 38 which has a radial passageway 39, conveying any oil away from the opening 29 and thence by a peripheral passageway 40 to the inlet port |9 so that the incoming oil is supplied from the port I9 through a radial port 4| in the central member 33 to one side of the gears 36 and 31, by the rotation of which the liquid is discharged from the other wire of said gears through an inclined passageway 42, also in the central pump member 33 to one side of a pair of gears 43 and 44 located in an opening 45 in a pump member 46, one of which is tight on the auxiliary shaft 21. The liquid passes from the outlet side of the gears 43 and 44 into a passageway 48 in a spacing member 49 located around the shaft 21 and which is clamped to the central pump member 33 by screws 32 which pass through a rear end plate 5|. The liquid under pressure, after passing through the passageway 48, proceeds in a radial direction through a slot 52 in the end plate 5| and thence into an annular passageway 53 around the same, so that the liquid at this point may take a double path, one path being forwardly through a peripheral port 54 in the spacing member 49 and thence through a port 55 in the member 46 and a passageway 56 to an impact cushion-chamber 51 in a removable dome 58 on the pump casing 3, to relieve the initial starting torque, but the main flow of the liquid passes around the outer periphery of the end plate 5| and thence past an annular rubber seal 59 which is retained in an annular recess 60 on a rearward extension of the end member 5|. The liquid thus discharged around the annular rubber ring 59 is received in a pressure reservoir 6I in the pump casing 3 from which it is supplied through an outlet port 62 by a. flexible tube 63 to any point where the pressure liquid is to be utilized. The pressure built up in the chamber 6| by the rotation of the gears 36 and 31, 43 and 44,

is communicated to a piston 65, having on its face a sealing ring 66 of the same rubber material in the pressure reservoir 6|, which piston carries a compression plate 61 thereon inside the casing 2. The compression plate 61 supports the forward ends of the springs I1. Thus, as the pressure accumulates in the chamber 6| the compression plate 61 is gradually pushed to the rear until a Bakelite circuit breaker 68, secured to the piston 65, breaks the electrical circuit which drives the motor 20. For this purpose the circuit breaker 68 is brought into contact at the rear part of its path of movement with a button 69 on the end of a slidable sleeve 10, which is secured thereto by a rivet 1| which also passes through a stop sleeve 12 on the outside of the sleeve 10, which in turn is supported in the end of the casing 2 by a Bakelite plug 14 and Bakelite and metallic washers 15 and 16, as well as nuts 11 and 18 between which the end of a circuit wire 19 is clamped. It will be noted that on the screwthreaded end of the rod 13, in front of the Bakelite plug 14, there is a Bakelite Washer 19a, a Washer and a nut 8| which serve to clamp in place two grounded contact arms 82 and 83 which have leaf springs 84 and 65, respectively. above the same. The inner ends of these contact arms 82 and 83 carry rollers 86 and 81, respectively, which are arranged to ride on the squared face of a slidable conducting sleeve 88 mounted on the sliding sleeve 10. At its forward end the conducting sleeve 88 has a flange 89 and next to it a mica disk 90 acting as a spark arrester and in front of this a Bakelite non-conducting sleeve 9|, also squared, and having a limiting flange 92 at its forward end similar in shape to a limiting flange 93 at the rear end of the sleeve 88. At the rear of the flange 93 there is a spring housing 94 which contains a light spring 95 around a stop sleeve 96, the rear end of the spring 95 being supported against a vflanged disk 91, on the other side of which there is a stronger spring 98 resting against the washer 80. At the forward end of the sleeve 10 there is a spring housing 99 which encloses a light spring |00. This arrangement is such that when the circuit breaker 68 pushes the button 69 to the rear, this direction of movement will continue until the rear end of the sleeve 12 reaches the rear portion of the spring housing 99 and thereafter the slight added push on the button 69 will cause the rollers 86 and 81 to snap onto the non-conducting sleeve 9| through the action of the spring |00. The spring |00 of itself is not strong enough to snap the rollers 86 and 81 onto the non-conducting ring 9|. In the reverse movement, after the circuit breaker 68 has released the button 69, when the liquid pressure is low enough to permit this forward movement of the circuit breaker -68, the spring 98 moves the sleeve 96 forwardly until it contacts with the forward end of the spring housing 94, whereupon a slight added push will induce the spring 95 to snap the rollers 86 and 81 into the position shown in Fig. 3. ,The circuit arrangement, including the electric motor 20 and the switch just described, comprises a battery |0|, one side of which is connected to the ground |02 and the other side of which is connected by a wire |04 to one pole |05 of the motor-20. The wire 19 leads to the remaining pole |06 of the motor 20. Preferably, also, this pole |06 is connected |01 to a dash light |03 connected by a wire |39 to the 1|34, so that whenever the urrent is being supplied to the motor 2l, kdue to the lightened prusure in the liquid, the dash light |33 will be illuminated. Inasmuch as only very little liquid is utilized in the operation of the accessory there is only a very little drop in the at any time, and. therefore, the dash light i" will only be illuminated at infrequent intervals. In the operation of this form of my invention the low pressure liquid will pass into the reservoir 2 and thence through the filter cloth 9, which will remove all the accumulated scale and dirt. and thereafter enter the pump, from which, when the current is on, that is to say when the circuit breaker 5I is in its forward position due to the decrease of pressure in the reservoir 4|, the rotation of the pump will rapidly build up the pressure so as to further compress the springs |1 until the circuit is again broken by the rollers 55 and 31, passing onto the Bakelite sleeve 9|. While the current is on, the dash light |09 will show` up but as soon as the current is broken it will, of course, cease to be lighted.

In the modified form of my invention as shown in Figs. 5 to 8, certain' features, including the accumulator, have been' changed somewhat. However, the construction is the same as in the form inthe preceding figures except in the following respects: In this instance the motor shaft 22 is connected by a universal joint |59 of any conventionaly construction, to the pump shaft 24. In this instance, furthermore, there is a modiiied form of accumulator plunger ||I| which, in order to avoid scoring of the plunger by accumulated dirt, has a liquid seal at the righthand end of said plunger and which, at its ex treme right-hand end, is provided with a clearance ||2 for the same purpose. It will be noted that this plunger Ilo operates in acylinder H3 which in this instance, to avoid undue length of the apparatus, extends into the interior of the supply reservoir, said cylinder being located within a pump casing 4 suitably constructed for this purpose. It will be noted that the pump casing ||4 has aiiange ||4a for attaching it to a motor casing I|4b to shorten up the. assembly. In this instance, furthermore, it will be noted that in the pump there is a low pressure intake ||4c which is located to the left of the first gear cavity. Also, as shown in Fig'. 15, there is a dome ||4d` drilled into the central stationary pump member connecting with the liquid passageway therein to balance the pulsations between the rst and second gear cavities. Furthermore, in lthis instance I have provided an unloader valve |`|4e in the discharge passageway from the spacing member at the right-hand end of the pump. The said unloader valve is provided with a constricted portion ||4f which is adapted to unload the pressure on the outlet from the pump when the ow drops to a predetermined minimum rate by establishing communication between a passageway ll4g and an equalizing passageway I |4h leading through the low pressure inlet to the pump. The lower end of the unloader valve ||4e cuts of! communication between said passageways when the flow of the uid is sumcient, by acting on a` piston head ||4i of the unloader valve to hold the valve in its uppermost position against the pressure of the pumped duid. In other words, when the pressure drops, that is when the motor is cut off, thepressure of the trapped fluid will push the unloader valve ||4e down, where it will lestablish communication between passageways my and mh. Thus, when the ammunmi' switch cuts in the electric motor will, therefore, f

start with no load asitwill havetoobtain suiii.

ucient speed to create enough flow to lift the lm-A loader valve against the pressure. Within the I plunger ||3 there is a central recess ||5 to re- -ceive a hexagonal rod ||9 to enable it to be held from turning when the apparatus is being assembled, the same being adapted to receive in itsend a screw ||1 for holding in place a dished I spring retainer `||3 which extends aroimd the outside oi' the cylinder ||3 for retaining thesprings |1 in place at one end thereof. The said screw lil isk carried in a narrow extension ||9 of the said hexagonal rod H3, the outside of ll which extension is screw-threadedand carries thereon a lock washer and a nut |2|. A' lock washer |22 is carried around the screw `||1 at the end of the reduced extension III. 'Ihe said screw ||1, furthermore, has a head |23 with a n central slit |24 to receive loosely therein a tongue |25 of a switch operating rod |23, said tongue being held loosely in place to allow slight lateral movement of the switch operating rod 23 by means of a pin |21. On the head |23 of the n said screw there is carried a spring housing |23 which is held in place thereon by a snap-ring- |29 and adjacent to the face of the said head |23 there is a washer |30 against which one end of a spring |3| rests. I'he said spring |3| is lo- 'a for cooperating with a plurality ofrollers a which are carried, respectively', on arms |31 supported on pivots |38 on an end casting |39, which also is provided with lugs for supporting springs |4| bearing against the said levers |31 to press them inwardly for snap action in cooperation with the. said flange |35. Within the switch operating sleeve |34 there is another spring housing |42 having within the same a spring |43 and held in place by a snap-ring |44 against a spring retaining washer |45 which rests against a head |45 on the rod |25. The said spring |43 is held at its other end by an inturned inwardly directed portion of the sleeve |42. Within said spring there is, furthermore, a stop sleeve |41, the left-hand end of which acts as 'u cylinders I5 by means of their screw-threaded m ends |49 located in the pump casing ||4. Lock nuts |50 fasten the said rods |45 in place. The right-hand ends of the said rods |43 have springretaining-disks |5| thereon which abut against nuts |52, which also serve to hold in place a ltersupporting perforated shell |53 for supporting a illter cloth |54, which filter cloth has at one' end a sealing and retaining ring |55 and at the other end a similar retaining ring |56 which holds its end of the lter cloth in a recess |51 on a ilange |59, which is also provided with a recess |59 for receiving the adjacent end of the shell |53. 'I'he said shell |53, at the right-hand end, is located against the casting |39 through which the rods |33 passand on the other side of u said casting the rods |48 have lock washers |60 and lock nuts l6l. The outer ends of the rods |48 pass through the enclosing shell of the reservoir, the left-hand end of the Shell being received against a gasket |62 in a recess on the pump housing 4 and against which it is held by nuts |63 and lock washers |64. There are six other screwthreaded rods |65 which are similar in every respect to the rods |48 except that they do not extend through the casting |39 but merely cooperate with the springs |1, the filter |53 and the pump housing ||4. The enclosing shell, furthermore, has at its top a vent opening |66 which is closed by a vented receptacle |61 packed with horsehair and covered with a ribbed cap |68 to permit the passage of `air between the ribs thereof. Furthermore, it will be noted that the righthand end of the filter cloth |54 is held tightly against the inner face of the enclosing shell so that the incoming oil must pass through the end of the shell |53 and thence radially through the lter cloth.

On the right-hand end of the enclosing shell, around a central opening therein, there is supported a switch housing |69 by screws |10. This switch housing |69 has a plurality of oil ports |1| which communicate with an oil recess |12 having a rubber gasket I 13 therein, U-shaped in cross-section, to seal a switch plunger |14 having an annular oil-carrying-recess |15, and on the left-hand end a push-plate |16 held in place by a screw |11. The said plate |16 is adapted to be operated by the switch operating sleeve |34. The rubber seal |13 rests against abacking piece |18 against which there is located a washer |19 held in place by a snap-ring |80 in the switch housing |69. Around the outside of the plunger |14 there is a stop snap-ring |8|. The righthand end of the plunger |14 rests against a Bakelite disk |82 which is supported in eyelet shaped rings |83 slidably carried on a plurality of studs |84 carrying coil springs |85 supported against heads |86 on said studs. The studs |84 are carried by a conducting plate |81 supported between Bakelite washers |88 by screws |89 from the switch housing |69. The said plate |81 carries thereon a contact ring |90 which is connected by a conductor |9| to a terminal |92 of the electric circuit, to which a wire |93 is connected. The terminal |92 is mounted in a switch cover |94 held in place by the screws |89 and from which it is suitably insulated in the usual way. On the switch cover |94 there is also located another terminal |95 to which the other wire |96 of the circuit is connected. The inner end of said terminal |95 is connected by a braided insulated wire |91 to a terminal |98 mounted on the Bakelite disk |82. It will be obvious that this form of my invention operates in substantially the same way as the form of my invention shown in Figs. l to 4. However, in this instance the plunger will not be scored by dirt as the sliding portion thereof is located in the ltered fluid to the left of the rubber seal Also, in this instance the switch, being located outside of the body of oil and being operated by the sleeve |34 and the push-plate |16 on the plunger |14, will not cause the deposition of metal electrolytically on the parts of the switch mechanism. Also, it will be seen that the switch may be more readily constructed and maintained in order because of its location and arrangement. Furthermore, the parts of the reservoir may be more readily constructed and assembled due to the absence of the flanges on the enclosing shell for attachment to the pump housing, as in the previously described form of my invention.

In the form of my invention shown in Fig. 9 there is a modified form of the switch in which sliding oil seals are obviated. The construction of the apparatus in this form of my invention is the same as that just described in connection with Figs. to 8 except as follows: In this instance the switch operating sleeve |34 is provided at the right-hand end with a Bakelite button |99 which is adapted to cooperate with a head 200 on the end of a switch-operating plunger Said plunger 20| carries adjacent to the head 200 one end of a rubber boot 202 which is fastened in place by snap rings 203, the other end of the said boot being similarly fastened in a screw-threaded hexagonal plug 204 through which the plunger 20| passes, said plug being screw-threaded in a casing 205 which is brazed into a hole at the end of the reservoir enclosing shell. Screw-threaded on the other end of the plug 205 there is a rubber or Bakelite terminal member 206 which carries two electric terminals 201 and 208 as the terminals of the switch. The extreme end of the said plunger 20| has loosely mounted on a reduced extension a Bakelite disk 209 having a bridging contact ring 2|0 secured to the periphery thereof, the disk 209 and plunger 20| being normally moved toward the left by a spring 2|0 carried in a spring pocket 2|| riveted to an enclosing cap 2|2 which has a spring tongue 2|3 for holding the cap in an annular recess on the insulating terminal piece 206. 'I'he operation of the switch in this form of my invention is similar, because of its location, to the operation of the form of my invention shown in Figs. 5 to 8. However, in this instance the use of the boot 202 eliminates the necessity of sliding seals for the switch construction and the parts herein are much more simple and readily manufactured.

As shown in Fig. 10, the system may be provided with a circuit containing a magnetic switch permitting the operation initially of the pressure switch by a primary current of, for instance, seven amperes, and then when the magnetic switch cuts in to apply to the motor a greater ampere of about forty to fifty amperes. This magnetic switch may also have contacts for cutting out a standard current and voltage regulator at times and for brief intervals so as to secure the maximum current from the generator when needed. In this arrangement the terminal |96, for example, leads to switch terminals 2| 4 and 2|5 on a dash panel 2|6 having a wire 2|1 thereon containing a lamp which in turn is connected to a series winding 2|8 of a compound motor 2|9 for driving the pump, the other terminal of the motor being grounded. The said wire 2|1 has a branch 220 leading to a terminal 22| of a magnetic switch 222 which is provided with a magnetically operated core 223 adapted to be operated by low voltage primary circuit windings 224 connected to the terminal |93. The said core carries a circuit closing plate 225 adapted to Jcut in a higher amperage to the motor, as shown,.for bridging across the contact 22| and a contact 226 in the circuit with the windings 224, which in turn are connected by a wire 221 and a wire 228 to a storage battery 229, the other terminal of which has a ground 230. The said wire 221, furthermore, has a branch 23| which leads to a standard current and voltage regulator 232, the other terminal of which is connected by a wire 222 to the neld'of a generator 22|, the amature thereof being connected by a wire 235 to a switch contact 226 adapted to be bridged by a contact plate 221 on the plunger 223 with a contact 238 connected by a wire 239 with the wire 288. By means of this magnetic switch, when needed, the entire current from the generator may be utilized by automatically cutting out the current from the current and voltage regulator, which can be done eiIectively for short intervals without damaging the generator. l

The circuit arrangement in Figs. ll to 13 is a modiiied i'orm oi' the magnetic switch construction but in which the wiring is simpler for the reason that one of the terminals of the magnetic switch is grounded at 240 and the current and voltage regulator is grounded at 2li. In this instance, also, a slightly dierent type of generator 2&2 is shown.

While I have described my invention above in detail I wish it to be understood* that many changes may be made therein without departing from the spirit of the same.

I claim:

l. A circulating system, comprising a pump, a supply reservoir for receiving accumulated liquid, said reservoir having therein means to apply pressure above the minimum of the liquid supplied by the pump, an electric motor for driving said pump, and a circuit breaker in the reservoir for determining the operation of the motor.

2. A circulating system, comprising a pump, a supply reservoir for receiving accumulated liquid, said reservoir having therein a compressed spring to apply pressure above the minimum of the liquid supplied by the pump, an electric motor for driving said pump. and a circuit breaker in the reservoir for determining the operation of the motor.

3. A circulating system, comprising a pump, a supply reservoir for receiving accumulated liquid, said reservoir having therein means to apply pressure above the minimum of the liquid supplied by 45 the pump, an electric motor for driving said pump,

and a liquid-submerged circuit breaker inthe reservoir tor determining the operation of the motor,

4. A circulating system, comprising a pump, a supply reservoir for receiving accumulated liquid, said reservoir having therein a compressed spring to apply pressure above the minimum of the liquid supplied by thepump. an electric motor for driving said pump, and a liquid-submerged circuit breaker in the reservoir for determining the operation of the motor'.

5. A circulating system, comprising a pump, a

supply reservoir for receiving accumulated liquid to be supplied to said pump, said reservoir having therein means to apply pressure above a minimum of the liquid delivered bythe pump, and an annular iilter for the incoming liquid, contained in said reservoir.

6. A circulating system, comprising a pump, a supply reservoir for receiving accumulated liquid to .be supplied to said pump, said reservoir having therein a compressed spring to apply pressure above the minimum of the liquid delivered by the pump, and an annular iilter for the incoming liquid contained in said reservoir.

7. In combination, a circulating system, including a pump, a pressure reservoir for receiving liquiid therefrom, a supply reservoir for the pump,

and an annular lter located in the supply reservoir the supply reservoir having its intake within said annular iilter.

8. A circulating system, comprising a pump, a supply reservoir for receiving accumulated liquid to be supplied to said pump, said reservoir having therein a compressed spring to apply pressure above the minimum of the liquid delivered by the pump, and an annular niter for the incoming liquid contained in said reservoir around the sp 9. In combination, a pressure reservoir having a casing, means for supplying liquid under pressure to said reservoir, a movable wall in said reservoir, a supply reservoir adjacent to said casing, and means in the supply reservoir for applying pressure to the movable wall, comprising a plurality o! springs under compression, a movable plate for receiving the reactive force of said springs, and means connecting said plate to the movable wall.

10. In combination, a pressure reservoir having a casing, means for supplying liquid under pressure to said reservoir, a movable wall in said reservoir, a supply reservoir adjacent to said casing, and means in the supply reservoir for applying pressure to the movable wall, comprising a plurality of coil springs under compression, a movable plate for receiving the reactive i'orce of said' springs, means connecting said plate to the movable wall; and internal members for guiding andy supporting said springs, adapted to be supported in said casing.

11. In combination, a pressure reservoir having a casing, means for supplying liquid under pressure to said reservoir, a movable wall in said reservoir, a Supply reservoir adjacent to said casing, and means in the supply reservoir for supplying pressure to the movable wall, comprising a plurality of coil springs under compression,.a movable plate for receiving the reactive force of said springs; means connecting said plate to the movable wall, and internal members for guiding and supporting said springs, adapted to be supported in said casing, rods provided inside the spring supporting members and attached to said casing, said rods having at their two ends iilters supporting members, one of which is in the form of a spring disk and having thereon an annular lter adapted to be pressed thereby against the wall of the supply reservoir.

l2. In combination, a pressure reservoir, a movable wall thereon, an electrically controlled pumping means for supplying liquid under pressure to said reservoir, a supply reservoir, and a circuit breaker for the electrically controlled pumping means located in the supply reservoir.

13. In combination, a pressure reservoir, a

movable wall thereon, an electrically controlledk lpumping means, located in the supply reservoir,

said circuit breaker comprising a switch having pressure-accumulating springs for snapping the same into on and off positions.

15. In combination, a pressure reservoir, a movable wall thereon, an .electrically controlled pumping means for supplying liquid under pressure to said reservoir, a supply reservoir, and a circuit breaker for the electrically controlled pumping means, located in the supply reservoir,

, said circuit breaker comprising a switch having a pressure accumulating spring at each end of the circuit breaker and ra stronger follower spring, for snapping the same into on and on! positions.

16. In combination, an electric motor having a shaft, a pump casing having a rotary pump connected to said shaft, the said casing having a pressure reservoir on the end of the said pump opposite the said motor, and a movable wall associated with said casing for producing pressure in the reservoir.

17. In combination, an electric motor having a shaft, a pump casing having a rotary pump connected to said shaft, the said casing having a pressure reservoir on the end of the said pump opposite the said motor, a movable wall associated with said casing for producing pressure in the reservoir, and a supply reservoir connected to the pump casing beyond the pressure reservoir.

18. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator, and a switch adapted to be operated thereby located outside of said accumulator, said switch comprising a liquid sealed plunger extending outside the accumulator.

19. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator, and a switch adapted to be operated thereby located outside of said accumulator, said switch comprising a liquid sealed plunger, having a sealing boot providing a seal, extending to the outside of the accumulator.

20. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switchI operating device located in said accumulator, and a switch adapted to be operated thereby located outside of said accumulator, said switch comprising a liquid sealed plunger, having a sealing boot providing a seal, extending to the outside of the accumulator and a circuit-bridging spring-pressed contact.

21. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator, and a switch adapted to be operated thereby located outside of said accumulator, said switch comprising a liquid sealed plunger, having a sealing boot providing a seal, extending to the outside of the accumulator and a circuit-bridging spring-pressed contact capable of self-alignment in completing the circuit.

22. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator and a plunger for supplying the liquid under pressure from the accumulator, having a connection to the pump circuit switch operating device constructed so as to permit self-alignment of said device,

23. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator and a plunger for supplying the liquid under pressure from the accumulator, having a connection to the pump circuit switch operating device constructed so as to permit self-alignment of said device, said device comprising a snap action circuit breaker.

24. In combination, a pump, an electric motor for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator and a plunger for supplying the liquid under pressure from the accumulator, having a connection to the pump circuit switch operating device constructed so as to permit self-alignment of said device, said de-A vice comprising a snap action circuit breaker containing a sleeve movable relatively to said plunger, said sleeve having a tapered projection and a spring pressed lever cooperating therewith for producing a sudden action in making and breaking the circuit.

25. In combination, a pump, an electric motor having a circuit for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator and a switch adapted to be operated thereby, said switch being adapted to control the circuit, an electric generator in which the circuit is included, a. current and voltage regulator adapted to control the current and voltage delivered by the generator to the motor, and a switch adapted to cut out the operation of the regulator.

26. In combination, a pump, an electric motor having a circuit for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator and a switch adapted to be operated thereby, said switch being adapted to control the circuit, an electric generator in which the circuit is included, a current and voltage regulator adapted to control the current and voltage delivered by the generator to the motor, and a switch adapted to cut outthe operation of the regulator comprising two circuit-breaking switches.

27. In combination, a pump, an electric motor having a circuit for driving the same intermittently, an accumulator for supplying liquid from said pump under pressure, a pump circuit switch operating device located in said accumulator and a switch adapted to be operated thereby, said switch being adapted to control the circuit, an electric generator in which the circuit is included` a current and voltage regulator adapted to control the current and voltage delivered by the generator to the motor, and a switch adapted to cut out the operation of the regulator comprising two circuit-breaking switches, a contact leading to one of which being grounded.

28. In combination, a pump, an electric motor having a circuit for driving the same intermittently, a pump circuit-switch operating device, a switch adapted to be operated thereby, said switch being adapted to control the circuit, an electric generator in which the circuit is included, a current and voltage regulator adapted to control the current and voltage delivered by the generator to the motor, and means whereby the said switch is enabled to be actuated by a low amperage and which, when actuatedis adapted to apply to the motor a higher amperage.

29. In a pressure accumulator, the combination of a plunger adapted to supply liquid under pressure. an accumulator therefor adapted to store up pressure as applied to the plunger as well as liquid to be supplied by the plunger, a pump for supplying the pressure liquid to the plunger, an electric motor for driving the pump, and a switch associated with the accumulator for controlling the circuit to the electric motor, said plunger having a snap action actuator thereon for the said switch.

30. In a pressure accumulator, the combination of a plunger adapted to supply liquid under pressure, an accumulator therefor adapted to store up pressure as applied to the plunger, as well as liquid to be supplied by the plunger, a pump for supplying pressure liquid to the plunger, an electric motor for driving the pump, and a switch associated with the accumulator for controlling the circuit to the electric motor, a snap action spring arm mounted on the accumulator, said plunger having a snap action actuator thereon for the said switch, said snap action actuator comprising a cam block and a guiding sleeve attached thereto adapted to cooperate with said spring arm.

31. In a pressure accumulator, the combination oi a plunger adapted to supply liquid under pressure, an accumulator therefor adapted to store up pressure as applied to the plunger, as well as liquid to be supplied by the plunger, a pump for supplying pressure liquid to the plunger, an electric motor for driving the pump, and a switch associated with the accumulaton for controlling the circuit to the electric motor, said accumulator comprising a plurality of compressible springs, studs for supporting said springs, a snap action spring arm mounted on one oi' said studs on the accumulator, said plunger having a snap action actuator thereon for 'the said switch, said snap action actuator comprising a cam block and a guiding sleeve attached thereto adapted to cooperate with said spring arm.

32. In combination, an electric motor, a rotary pump axially aligned therewith to be driven thereby, a casing for said motor, a casing for the pump attached to the motor casing, anda pressure accumulator for liquid received from the pump having a housing clamped to the pump casing and coinciding axially with the axis of the electric motor and pump.

33. In combination, an electric motor, a rotary pump axially aligned therewith to be driven thereby, a casing for said motor, a casing for the pump attached to the motorcasing, and a pres,- sure accumulator for liquid received from the pump having a housing positioned axially with regard to the electric motor and pump, said accumulator having a plunger and means for storing up pressure therefrom within the accumulator and a switch on the end of said accumulator housing for controlling the operation of the electric motor adapted to be controlled by said plunger.

EDWARD A. ROCKWELL. 

